@Atily, the Garadget integration with SmartThings has not been developed by, and is not an official Garadget Integration.
I am the developer, and i have also stopped using SmartThings because the cloud scheduler within SmartThings is unreliable at best. i will say this though, if you are using the standard routines in SmartThings, i would recommend switching to using CoRE for configuring your automation, it has a more robust method for both recovering state when this is lost, as well as managing missed schedules. but ultimately i imagine as your IOT solution grows and becomes more complex, you will fall out of love with SmartThings.
I love the community, and the development environment for the most part. but the reliability just killed it for me and since i have moved to Homeseer i've not been happier, things just work as they should and i no longer spend lots of time trying to troubleshoot the ghost in the machine.